Re: [soa-rm-ra] Policy_Contract_Business diagram - some questions

[Danny Thornton <danny_thornton2@yahoo.com>]

Hi Micheal,

A proposition is an expression whose truth can be
measured.  The following is the definition from the
Business via Services section.

Proposition:  A proposition is an expression, normally
in a language that has a well-defined written form,
that expresses some property of the world from the
perspective of a stakeholder. The truth of the
proposition may be measured – using a decision
procedure – by examining the world and checking that
the proposition and the world are consistent with each
other.

The beginning diagram in the policies and contracts
model is a tie to the Business via Services section. 
The differentiating meaning between Policy and
Contract is in the Business Via Services world.  The
IT mechanisms measure the propositions of both
policies and contracts.

Danny

--- michael.poulin@uk.fid-intl.com wrote:

> Hi Folks,
> I guess you are having fun... at the F2F
> 
> I have (finally) looked at Policy_Contract_Business,
> posted recently, and would like to comment it. 
> 
> The Policy_Contract_Business diagram demonstrates a
> few things I do not catch:
> 1) what does mean a Policy contains many
> Propositions? Is it because this is the only way (?)
> to specify the state of the Policy? What does mean a
> Proposition gets satisfied in the State?
> 2) what particular architectural value a State adds
> to the Proposition or to a Policy if there are no
> constraints represented based on the State value
> (Private/Public)? This seems as incomplete a little.
> 3) the most problematic to me is the absence of
> relationship between a Contract and a Policy. If
> Proposition is interpreted as an "instance" of a
> Contract (which in such case becomes just a Contract
> Template), I think, I get it. That is, the Contract
> and the Policies are now in one document. (However,
> what the architectural difference a Public or
> Private Contract makes? Isn't this a security
> concern rather than architecture's one?). However,
> if you have different meaning for the Proposition, I
> certainly have a problem with it. 
> For these days, I am working on the XML Schema for
> the Service Contract for my organisation and, after
> a few energetic discussions, I have to say that we
> came up with a Contract Template which allows a
> reference to the Policy (in a Policy Repository) as
> well as a direct Policy inclusion in the actual
> Contract (aka Contract instance). 
> 4) once again, if the Proposition in the diagram is
> a Contract instance, why we do not name it an
> Agreement?
> 
> Thank you,
> - Michael 
> 


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